Here is what I did to upgrade on mac mini 2014 -
Use rufus to create the windows 11 install usb that bypasses all windows 11 requirements (tpm etc.) Make sure it is the same language as your win 10 install or it can't do the upgrade. I accidentally selected English international rather than US and had to redo the installer.
Then run setup.exe from it, and you should be able to perform the upgrade. I had no issues, but you may want to back up your windows 10 installation just in case.
I used DiskGenius free to make a bootable clone on an external ssd.